MBK175 Siemens 175A 2-Pole Main Circuit Breaker Kit, 120/240V

MBK175 Siemens 175A 2-Pole Main Circuit Breaker Kit, 120/240V

Trying to figure out if the Siemens MBK175 is the right main breaker for your panel? Here is the short version. The MBK175 is a 175A, 2-pole main circuit breaker for 120/240V single-phase power, and it comes with the mounting hardware to install it as the main in certain older Siemens panels. Its 22 kAIC interrupting rating is the measure of how much fault current it can safely stop.

One thing to confirm first: this is made for legacy Siemens Type EQ panels, the main-breaker load centers Siemens built before 2002. It does not fit the newer Ultimate, ES, or PL series. If your panel takes the EQ9684 main, this is the right part. Check your panel label or wiring diagram if you are unsure.

Common Applications

• Adding a 175A main breaker to a Siemens Type EQ main-lug panel
• Replacing a worn EQ9684 main breaker
• Main shutoff for 120/240V single-phase service
• Upgrades on older Siemens, ITE, or Gould panels

Key Features

• 175A main breaker: A 2-pole main for 120/240V single-phase power.
• Hardware included: Ships as a kit with the parts to install it as the main.
• Fits Type EQ panels: Works with legacy EQ load centers, not Ultimate or ES.
• Thermal-magnetic trip: Protects against overloads and short circuits.
• UL 489 listed: Tested and listed for safe overcurrent protection.

Specifications

• Manufacturer: Siemens
• Catalog Number: MBK175 (EQ9684 main)
• Type: Main circuit breaker kit, Type EQ
• Amperage: 175A
• Poles: 2 (uses four single-pole spaces)
• Phase: Single-phase
• Voltage: 120/240V AC
• Interrupting Rating: 22 kAIC at 240V
• Trip Type: Thermal-magnetic
• Connection: Plug-in
• Standard: UL 489

Product Identification

• Dimensions: 5.25 in x 3.25 in x 4.05 in
• Weight: 3 lb
• UPC: 662643673937

FAQ

What is the MBK175 used for? It adds or replaces a 175A main circuit breaker in a compatible older Siemens Type EQ load center.

How do I know if it fits my panel? It fits legacy Type EQ panels that accept the EQ9684 main. It does not fit Ultimate, ES, or PL panels. Check your panel diagram.

Is it a 2-pole breaker? Yes, it is 2-pole for 120/240V single-phase, and it takes up four single-pole spaces.

What does 22 kAIC mean? It is the amount of fault current the breaker can safely interrupt at 240V.

Does it include mounting hardware? Yes, it ships as a kit with the hardware to install it as the main in a compatible Type EQ panel.